Standard Michelson interferometric optical fiber sensors are used to make strain measurements on a carbon/carbon composite beam at temperatures as high as 800$DGR@C. Copper, titanium, aluminum, and combinations of the three are investigated as sputtered end mirrors for the Michelson sensor, and it is found that the copper mirrors maintained the highest reflectivity in the 100$DGR@C to 1000$DGR@C temperature range. All measurements indicate that the optical fibers become more brittle with prolonged exposure to high temperatures.
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